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= (4 x 14) - (3/4 x 22/7x 2 x 7) = 56 - 33 = 23 cm
luas diarsir = L bujursangkar - L yang diarsir
= (14x14) - (3/4 x 22/7 x 7 x 7) =196 - 231/2 = (392 - 231)/2 = 161/2
= 80,5 cm2
b. keliling diarsir = kll persegi + kll stg lingkaran + kll stg lingkaran - kll stg lingkaran
= (15+15+10+10) + 15/2pi + 10/2pi - 10/2pi = 50 +15/2pi = 57,5pi
luas diarsir = L persegi + L stg lingkaran = (15 x 10) + ((7,5 x 7.5)pi/2) = 150 +28,125pi
= 178,125pi m2
d. luas 1/2 lingkaran= 1/2×22/7×21/2×21/2= 693cm